Running on the Main Thread
Run the sample app and select the row called Main Thread. Notice that the five initial items in the table view are initially visible, but they cannot be scrolled and the UI is completely unresponsive while the additional items are being added. There is logging to demonstrate that the additional items are being added while the UI is frozen—view the debugging console while running the app to see the logging. The frozen UI is obviously not a desirable user experience, and it is unfortunately easy to get a situation like this to happen in an app. To see why this is happening, take a look at the ICFMainThreadLongRunningTaskViewController class. First, the array to store display data is set up and given an initial set of ...
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